Like: A little expensive but not fun. A lightweight. Relatively small (a nice feature when packing for travel) and the size needed for my small trailer. They work (so far). Dislikes: Materials and construction are only suitable for light use, but the curvature of the tire's surface is commensurate with the size of the larger tires (if a vehicle requires tires of this size, I would be concerned that these pads would not be sufficient). The base (bottom side) is designed for hard, flat surfaces such as garage floors. A gravel roadside, driveway, or dirt campground doesn't have a hard, flat surface that these wedges are best for. Concerns: Does the plastic become unacceptably brittle in the cold (Minnesota winter)? Is the material UV resistant or will it degrade if left outside in the sun (to protect a parked trailer that has been stored in Arizona for months)? My trailer wheels are much smaller than the curvature of the chocks. This will not hold the chocks in place when placed behind my trailer's wheels. Will a strong wind move them (the pads are very light and have great windproof pockets on the sides) allowing my trailer to roam free in the wind? Result. Concerned about long term (uncovered) outdoor suitability, especially when used on natural surfaces.